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Let us draw the representative point in black and the singular point in white (Fig. 8). We can then characterize stable equilibrium in the following way: If for a sufficiently small initial displacement of the black point, it remains near the white point, then the white point represents a stable state of equilibrium.

(Andronow & Chaikin, Theory of Oscillations 1.3, tr. S. Lefschetz)

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